CA2107472C - Production of phosphoric acid and hydrogen fluoride - Google Patents

Production of phosphoric acid and hydrogen fluoride Download PDF

Info

Publication number: CA2107472C
Authority: CA; Canada
Prior art keywords: phosphoric acid; calcium; fluoride; hydrogen fluoride; slurry
Prior art date: 1990-12-31
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Fee Related

Application number

CA002107472A

Other languages

English (en)

French (fr)

Other versions

CA2107472A1 (en

Inventor

William R. Erickson

Leif E. Bouffard

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Phosphate Engineering & Construction Corp

Original Assignee

Phosphate Engineering & Construction Corp

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1990-12-31

Filing date

1991-12-30

Publication date

2002-07-30

1991-12-30 Application filed by Phosphate Engineering & Construction Corp filed Critical Phosphate Engineering & Construction Corp

1992-07-01 Publication of CA2107472A1 publication Critical patent/CA2107472A1/en

2002-07-30 Application granted granted Critical

2002-07-30 Publication of CA2107472C publication Critical patent/CA2107472C/en

2011-12-30 Anticipated expiration legal-status Critical

Status Expired - Fee Related legal-status Critical Current

Links

NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 281
229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 140
KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 title claims abstract description 112
229910000040 hydrogen fluoride Inorganic materials 0.000 title claims abstract description 102
238000004519 manufacturing process Methods 0.000 title claims description 25
238000000034 method Methods 0.000 claims abstract description 103
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 90
239000002367 phosphate rock Substances 0.000 claims abstract description 81
WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 78
229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 77
239000002253 acid Substances 0.000 claims abstract description 65
OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 22
QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 10
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 6
229910021529 ammonia Inorganic materials 0.000 claims abstract description 5
229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 3
VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 86
239000002002 slurry Substances 0.000 claims description 60
229910052731 fluorine Inorganic materials 0.000 claims description 49
239000011737 fluorine Substances 0.000 claims description 49
239000000377 silicon dioxide Substances 0.000 claims description 41
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 38
239000011575 calcium Substances 0.000 claims description 38
229910052791 calcium Inorganic materials 0.000 claims description 38
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
229910001868 water Inorganic materials 0.000 claims description 33
239000011435 rock Substances 0.000 claims description 21
235000012239 silicon dioxide Nutrition 0.000 claims description 17
239000007787 solid Substances 0.000 claims description 17
239000000203 mixture Substances 0.000 claims description 16
VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 14
PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 11
238000001914 filtration Methods 0.000 claims description 10
239000012066 reaction slurry Substances 0.000 claims description 10
238000011084 recovery Methods 0.000 claims description 10
229910000391 tricalcium phosphate Inorganic materials 0.000 claims description 8
229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
239000001506 calcium phosphate Substances 0.000 claims description 6
238000004821 distillation Methods 0.000 claims description 6
QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 6
229940078499 tricalcium phosphate Drugs 0.000 claims description 6
235000019731 tricalcium phosphate Nutrition 0.000 claims description 6
238000002156 mixing Methods 0.000 claims description 5
230000000717 retained effect Effects 0.000 claims description 5
229910019142 PO4 Inorganic materials 0.000 claims description 3
NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
239000010452 phosphate Substances 0.000 claims description 3
238000010992 reflux Methods 0.000 claims description 3
150000003839 salts Chemical class 0.000 claims description 3
238000005201 scrubbing Methods 0.000 claims description 3
PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 2
230000003134 recirculating effect Effects 0.000 claims description 2
239000011369 resultant mixture Substances 0.000 claims description 2
229910001388 sodium aluminate Inorganic materials 0.000 claims description 2
150000004684 trihydrates Chemical class 0.000 claims description 2
239000007795 chemical reaction product Substances 0.000 claims 1
238000004064 recycling Methods 0.000 claims 1
238000004062 sedimentation Methods 0.000 claims 1
PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 abstract description 4
IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 abstract description 3
DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 abstract description 3
KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 abstract description 3
MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 abstract description 2
-1 alu-minum trihydrate Chemical class 0.000 abstract description 2
239000011775 sodium fluoride Substances 0.000 abstract description 2
235000013024 sodium fluoride Nutrition 0.000 abstract description 2
RPAJSBKBKSSMLJ-DFWYDOINSA-N (2s)-2-aminopentanedioic acid;hydrochloride Chemical class Cl.OC(=O)[C@@H](N)CCC(O)=O RPAJSBKBKSSMLJ-DFWYDOINSA-N 0.000 abstract 1
229910052782 aluminium Inorganic materials 0.000 abstract 1
235000010210 aluminium Nutrition 0.000 abstract 1
229960000510 ammonia Drugs 0.000 abstract 1
YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 38
238000006243 chemical reaction Methods 0.000 description 38
239000010440 gypsum Substances 0.000 description 32
229910052602 gypsum Inorganic materials 0.000 description 32
239000000047 product Substances 0.000 description 19
239000000706 filtrate Substances 0.000 description 11
KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 9
239000010436 fluorite Substances 0.000 description 9
238000010586 diagram Methods 0.000 description 8
238000004458 analytical method Methods 0.000 description 6
238000001816 cooling Methods 0.000 description 6
230000007062 hydrolysis Effects 0.000 description 6
238000006460 hydrolysis reaction Methods 0.000 description 6
238000000926 separation method Methods 0.000 description 6
150000004673 fluoride salts Chemical class 0.000 description 5
150000002222 fluorine compounds Chemical class 0.000 description 5
238000003860 storage Methods 0.000 description 5
229910052681 coesite Inorganic materials 0.000 description 4
229910052906 cristobalite Inorganic materials 0.000 description 4
230000007423 decrease Effects 0.000 description 4
238000001704 evaporation Methods 0.000 description 4
230000008020 evaporation Effects 0.000 description 4
229910052739 hydrogen Inorganic materials 0.000 description 4
239000001257 hydrogen Substances 0.000 description 4
239000007788 liquid Substances 0.000 description 4
230000014759 maintenance of location Effects 0.000 description 4
238000003756 stirring Methods 0.000 description 4
229910052682 stishovite Inorganic materials 0.000 description 4
229910052905 tridymite Inorganic materials 0.000 description 4
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
238000009826 distribution Methods 0.000 description 3
ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 3
238000011282 treatment Methods 0.000 description 3
CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
150000007513 acids Chemical class 0.000 description 2
238000010923 batch production Methods 0.000 description 2
229910002092 carbon dioxide Inorganic materials 0.000 description 2
229910001610 cryolite Inorganic materials 0.000 description 2
239000013078 crystal Substances 0.000 description 2
239000003344 environmental pollutant Substances 0.000 description 2
239000011521 glass Substances 0.000 description 2
238000012432 intermediate storage Methods 0.000 description 2
239000002686 phosphate fertilizer Substances 0.000 description 2
231100000719 pollutant Toxicity 0.000 description 2
229910052710 silicon Inorganic materials 0.000 description 2
239000010703 silicon Substances 0.000 description 2
239000011734 sodium Substances 0.000 description 2
238000005406 washing Methods 0.000 description 2
SMNDYUVBFMFKNZ-UHFFFAOYSA-N 2-furoic acid Chemical compound OC(=O)C1=CC=CO1 SMNDYUVBFMFKNZ-UHFFFAOYSA-N 0.000 description 1
101100113576 Arabidopsis thaliana CINV2 gene Proteins 0.000 description 1
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
229910003638 H2SiF6 Inorganic materials 0.000 description 1
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
229910004074 SiF6 Inorganic materials 0.000 description 1
QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
238000013019 agitation Methods 0.000 description 1
238000003915 air pollution Methods 0.000 description 1
229910052925 anhydrite Inorganic materials 0.000 description 1
230000015572 biosynthetic process Effects 0.000 description 1
239000006227 byproduct Substances 0.000 description 1
229910052799 carbon Inorganic materials 0.000 description 1
239000001569 carbon dioxide Substances 0.000 description 1
239000003153 chemical reaction reagent Substances 0.000 description 1
239000012141 concentrate Substances 0.000 description 1
238000009833 condensation Methods 0.000 description 1
230000005494 condensation Effects 0.000 description 1
238000011109 contamination Methods 0.000 description 1
230000003247 decreasing effect Effects 0.000 description 1
239000008367 deionised water Substances 0.000 description 1
229910021641 deionized water Inorganic materials 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
230000029087 digestion Effects 0.000 description 1
LRCFXGAMWKDGLA-UHFFFAOYSA-N dioxosilane;hydrate Chemical compound O.O=[Si]=O LRCFXGAMWKDGLA-UHFFFAOYSA-N 0.000 description 1
239000003651 drinking water Substances 0.000 description 1
235000020188 drinking water Nutrition 0.000 description 1
230000008030 elimination Effects 0.000 description 1
238000003379 elimination reaction Methods 0.000 description 1
230000007613 environmental effect Effects 0.000 description 1
239000012467 final product Substances 0.000 description 1
239000012530 fluid Substances 0.000 description 1
239000007789 gas Substances 0.000 description 1
230000005484 gravity Effects 0.000 description 1
BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
150000002431 hydrogen Chemical class 0.000 description 1
239000012535 impurity Substances 0.000 description 1
239000002198 insoluble material Substances 0.000 description 1
239000013461 intermediate chemical Substances 0.000 description 1
239000000463 material Substances 0.000 description 1
230000006911 nucleation Effects 0.000 description 1
238000010899 nucleation Methods 0.000 description 1
WKFBZNUBXWCCHG-UHFFFAOYSA-N phosphorus trifluoride Chemical class FP(F)F WKFBZNUBXWCCHG-UHFFFAOYSA-N 0.000 description 1
239000002244 precipitate Substances 0.000 description 1
238000002271 resection Methods 0.000 description 1
229910052708 sodium Inorganic materials 0.000 description 1
159000000000 sodium salts Chemical class 0.000 description 1
BFXAWOHHDUIALU-UHFFFAOYSA-M sodium;hydron;difluoride Chemical compound F.[F-].[Na+] BFXAWOHHDUIALU-UHFFFAOYSA-M 0.000 description 1
238000010408 sweeping Methods 0.000 description 1
ZEFWRWWINDLIIV-UHFFFAOYSA-N tetrafluorosilane;dihydrofluoride Chemical compound F.F.F[Si](F)(F)F ZEFWRWWINDLIIV-UHFFFAOYSA-N 0.000 description 1
239000002699 waste material Substances 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/192—Preparation from fluorspar
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/2208—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with an acid or a mixture of acids other than sulfuric acid
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/223—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/22—Fluorides
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates

Landscapes

Chemical & Material Sciences (AREA)
Organic Chemistry (AREA)
Inorganic Chemistry (AREA)
Life Sciences & Earth Sciences (AREA)
Geology (AREA)
Silicon Compounds (AREA)
Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Saccharide Compounds (AREA)
Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Silicates, Zeolites, And Molecular Sieves (AREA)
Removal Of Specific Substances (AREA)

CA002107472A 1990-12-31 1991-12-30 Production of phosphoric acid and hydrogen fluoride Expired - Fee Related CA2107472C (en)

Applications Claiming Priority (5)

Application Number	Priority Date	Filing Date	Title
US63625490A	1990-12-31	1990-12-31
US636,254		1990-12-31
US07/808,641 US5180569A (en)	1990-12-31	1991-12-17	Process for the production of phosphoric acid and hydrogen fluoride from phosphate rock and fluosilicic acid
US808,641		1991-12-17
PCT/US1991/009532 WO1992012095A1 (en)	1990-12-31	1991-12-30	Production of phosphoric acid and hydrogen fluoride

Publications (2)

Publication Number	Publication Date
CA2107472A1 CA2107472A1 (en)	1992-07-01
CA2107472C true CA2107472C (en)	2002-07-30

Family

ID=27092557

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA002107472A Expired - Fee Related CA2107472C (en)	1990-12-31	1991-12-30	Production of phosphoric acid and hydrogen fluoride

Country Status (10)

Country	Link
US (2)	US5180569A (he)
EP (2)	EP0616601B1 (he)
CN (1)	CN1030305C (he)
AT (2)	ATE136008T1 (he)
AU (1)	AU654790B2 (he)
CA (1)	CA2107472C (he)
DE (2)	DE69132718T2 (he)
ES (2)	ES2085621T3 (he)
IL (1)	IL100495A (he)
WO (1)	WO1992012095A1 (he)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5531975A (en) *	1990-12-31	1996-07-02	Phosphate Engineering And Construction Co., Inc.	Process for the production of phosphoric acid and calcium fluoride
US5853685A (en) *	1996-08-28	1998-12-29	Erickson; William R.	Process for the production of high purity silica from waste by-product silica and hydrogen fluoride
US6179901B1 (en)	1999-06-14	2001-01-30	Louis J. Lamb	Apparatus and method for producing HF from phosphate rock
ZA200002638B (en) *	2000-05-26	2001-01-31	Jan Christoffel De Waal	The production of dicalcium phosphate or monocalcium phosphate.
US6676914B1 (en) *	2000-06-09	2004-01-13	Hf Extraction, Llc	Phosphate acidulation utilizing HF acid
ES2259176T3 (es) *	2002-10-17	2006-09-16	Ntn Corporation	Seguidor de leva de rodillo para un motor.
US7482376B2 (en)	2003-07-03	2009-01-27	3-Dimensional Pharmaceuticals, Inc.	Conjugated complement cascade inhibitors
US8623318B2 (en) *	2004-07-12	2014-01-07	Powell Technologies Llc	Manufacture of high-strength, low-salt aqueous sodium hypochlorite bleach and substantially dry crystalline salt
ES2377757T3 (es) *	2008-10-28	2012-03-30	Alstom Technology Ltd	Procedimiento y dispositivo para verificar y controlar la eliminación del fluoruro de hidrógeno de un gas de proceso.
CN102674255A (zh) *	2012-05-08	2012-09-19	安徽锦洋氟化学有限公司	一种利用氟化铝尾气加热给料酸的生产工艺和设备
CN103058224A (zh) *	2013-01-11	2013-04-24	瓮福（集团）有限责任公司	一种回收湿法磷酸尾气中氟生产氟化氨的方法
CN104511208B (zh) *	2013-12-19	2017-01-18	广西鹿寨化肥有限责任公司	三水氟化铝料浆过滤设备
CN104511207B (zh) *	2013-12-19	2016-07-13	广西鹿寨化肥有限责任公司	三水氟化铝料浆过滤方法
CN103754920B (zh) *	2014-01-22	2014-12-17	瓮福（集团）有限责任公司	一种纳米硫酸钙的制备方法
CN104030317B (zh) *	2014-06-25	2016-04-27	江西渠成氟化学有限公司	一种氟硅酸生产氟化钠联产冰晶石白炭黑生产工艺
DE102016212242B4 (de)	2016-07-05	2019-02-07	Technische Universität Bergakademie Freiberg	Verfahren zur Herstellung von Phosphorsäure aus phosphorhaltigen Primär- und Sekundärrohstoffen
CN110092523B (zh) *	2019-06-06	2022-01-07	盛隆资源再生（无锡）有限公司	一种含氟含氨氮含磷废水的处理方法
IL292196B2 (he) *	2019-10-17	2026-02-01	Ostara Nutrient Recovery Tech Inc	מערכות ושיטות לעיבוד פוספטים
CN111392754B (zh) *	2020-04-21	2022-05-03	深圳市考拉生态科技有限公司	由含氟固废物中提纯氯化钙的方法与设备
US11560310B1 (en)	2022-02-11	2023-01-24	Jesa Technologies Llc	Method for producing a calcium phosphate salt
CN118239461B (zh) *	2024-04-29	2025-09-30	多氟多新材料股份有限公司	一种二氟磷酸锂的除酸方法
CN118877896B (zh) *	2024-07-18	2025-05-06	四川大学	一种回收氟的湿法加工磷酸工艺

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US1313379A (en) *		1919-08-19	Chemical Construction Company	Process of making phosphoric acid, &c.
US2388135A (en) *	1943-09-27	1945-10-30	Phillips Petroleum Co	Recovery of hydrogen fluoride
US2456509A (en) *	1944-10-06	1948-12-14	Allied Chem & Dye Corp	Manufacture of hydrogen fluoride
US2507605A (en) *	1946-03-14	1950-05-16	Allied Chem & Dye Corp	Manufacture of hydrogen fluoride
US2702233A (en) *	1949-08-13	1955-02-15	Pennsylvania Salt Mfg Co	Production of hydrogen fluoride
US2635806A (en) *	1949-12-24	1953-04-21	August S Lermer	Means and method for mechanically assembling nomographic charts
US2636806A (en) *	1950-05-19	1953-04-28	Tennessee Corp	Acidulation of phosphate rock
US2728634A (en) *	1953-07-13	1955-12-27	Chemical Foundation Inc	Process of treating phosphate rock for recovery of fluorine chemicals and production of fertilizers
US3323864A (en) *	1963-08-29	1967-06-06	Fmc Corp	Production of phosphoric acid from a phosphatic ore
BE786915A (fr) *	1971-07-29	1973-01-29	Bayer Ag	Production d'acide fluorhydrique et de sulfates metalliques
US3811246A (en) *	1973-01-16	1974-05-21	W Erickson	Closed loop system for the elimination of fluorine pollution from phosphoric plants
SU551248A1 (ru) *	1973-06-20	1977-03-25	Ленинградский Ордена Трудового Красного Знамени Технологический Институт Им.Ленсовета	Способ получени фосфорной кислоты
IN154778B (he) *	1981-02-27	1984-12-15	Dharamsi Morarji Chemical Comp
ATE21882T1 (de) *	1982-02-23	1986-09-15	Dharamsi Morarji Chem Co	Verfahren zur herstellung von phosphorsaeure und gips in marktgaengiger form aus phosphatgestein.
FR2548653B1 (fr) *	1983-07-05	1986-11-07	Rhone Poulenc Chim Base	Procede de fabrication d'acide phosphorique
US4629610A (en) *	1985-05-10	1986-12-16	Dow Chemical Co.	Hydrogen fluoride recovery process

1991
- 1991-12-17 US US07/808,641 patent/US5180569A/en not_active Expired - Lifetime
- 1991-12-25 IL IL10049591A patent/IL100495A/he not_active IP Right Cessation
- 1991-12-30 AT AT92903560T patent/ATE136008T1/de not_active IP Right Cessation
- 1991-12-30 EP EP92903560A patent/EP0616601B1/en not_active Expired - Lifetime
- 1991-12-30 DE DE69132718T patent/DE69132718T2/de not_active Expired - Fee Related
- 1991-12-30 AU AU91668/91A patent/AU654790B2/en not_active Ceased
- 1991-12-30 DE DE69118406T patent/DE69118406T2/de not_active Expired - Fee Related
- 1991-12-30 EP EP95103818A patent/EP0669283B1/en not_active Expired - Lifetime
- 1991-12-30 ES ES92903560T patent/ES2085621T3/es not_active Expired - Lifetime
- 1991-12-30 AT AT95103818T patent/ATE205170T1/de not_active IP Right Cessation
- 1991-12-30 CA CA002107472A patent/CA2107472C/en not_active Expired - Fee Related
- 1991-12-30 WO PCT/US1991/009532 patent/WO1992012095A1/en not_active Ceased
- 1991-12-30 ES ES95103818T patent/ES2162626T3/es not_active Expired - Lifetime
- 1991-12-31 CN CN91112834A patent/CN1030305C/zh not_active Expired - Fee Related
1993
- 1993-12-02 US US08/160,629 patent/US5427757A/en not_active Expired - Fee Related

Also Published As

Publication number	Publication date
CN1030305C (zh)	1995-11-22
AU654790B2 (en)	1994-11-17
CN1063661A (zh)	1992-08-19
DE69118406T2 (de)	1996-10-24
CA2107472A1 (en)	1992-07-01
ATE136008T1 (de)	1996-04-15
ATE205170T1 (de)	2001-09-15
EP0669283A1 (en)	1995-08-30
US5427757A (en)	1995-06-27
ES2085621T3 (es)	1996-06-01
DE69132718D1 (de)	2001-10-11
US5180569A (en)	1993-01-19
AU9166891A (en)	1992-08-17
EP0616601B1 (en)	1996-03-27
EP0616601A1 (en)	1994-09-28
DE69118406D1 (de)	1996-05-02
IL100495A0 (en)	1992-09-06
WO1992012095A1 (en)	1992-07-23
EP0669283B1 (en)	2001-09-05
IL100495A (he)	1996-03-31
DE69132718T2 (de)	2002-07-04
ES2162626T3 (es)	2002-01-01

Legal Events

Date	Code	Title	Description
1998-11-17	EEER	Examination request
2007-12-31	MKLA	Lapsed

Publication	Publication Date	Title
CA2107472C (en)	2002-07-30	Production of phosphoric acid and hydrogen fluoride
CA1261116A (en)	1989-09-26	Process of removing cationic impurities from wet process phosphoric acid
US3024086A (en)	1962-03-06	Disposal of fluorine wastes
CA1088724A (en)	1980-11-04	Fluoride-free phosphate reactions
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US5531975A (en)	1996-07-02	Process for the production of phosphoric acid and calcium fluoride
US5382423A (en)	1995-01-17	Apparatus for recovering calcium fluoride from fluoroetchant
US4308244A (en)	1981-12-29	Process for producing fluorine compounds and amorphous silica
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US5055281A (en)	1991-10-08	Process for the preparation of calcium fluosilicate as a raw material for obtaining calcium fluoride and pure fluosilicic acid
US4213952A (en)	1980-07-22	Recovery of hydrofluoric acid from fluosilicic acid with high pH hydrolysis
US5679315A (en)	1997-10-21	Method of production of high purity silica
US3625648A (en)	1971-12-07	Recovery of fluorine and p2o5 from dilute aqueous acidic phosphatic solutions
US4160657A (en)	1979-07-10	Preparation of monocalcium phosphate and phosphoric acid
US20090110624A1 (en)	2009-04-30	Processes for Producing Phosphates
US3619136A (en)	1971-11-09	Process for producing phosphoric acid
US5312610A (en)	1994-05-17	Defluorination of phosphoric acid
CA1115483A (en)	1982-01-05	Preparation of monocalcium phosphate and phosphoric acid
US4062929A (en)	1977-12-13	Production of hydrogen fluoride
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US3764658A (en)	1973-10-09	Production of fluosilicic acid
US4178347A (en)	1979-12-11	Process for the simultaneous production of wet process phosphoric acid and sodium silicofluoride
US3743725A (en)	1973-07-03	Process for the recovery in useful form of fluorine values from phosphate rock while producing phosphoric acid
GB2094282A (en)	1982-09-15	Phosphoric acid manufacture
US4324774A (en)	1982-04-13	Method for the manufacture of defluorinated phosphatic products